Data Flow Diagram
Transcript: Terminators There are different levels of data flow diagram. The context level or level 0 data flow diagram is basically a diagram showing a very generalized diagram with the terminators linked to the current system as a whole. The next level is level 1. It would have many more processes, with more detail about all aspects of the system. It is important that the direction of data flow is accurately recorded and that each arrow is labeled to show what data is flowing at that point in the diagram. Data Flow Diagram The order has come from a customer; customers are not part of the process order system and so are placed in a terminator. When data flows from or to somebody or somewhere outside the system, that smehow or somewhere is called a terminator. by Ayesha Abdulhakim Al Sagaf Processes The data from the customers are the orders. This information is processed to produce the invoices. The process order is put in a process box. Flow arrows Peter and Irene deal with customer orders. The customer sends in an order to the company and it is checked to see if it has all the information required such as customer name and address and an order for an existing product. If it does not, it is rejected and sent back to the customer. If it does, the order is processed and the other information is printed and filed. In addition, an invoice is generated and filed ready to send to the customer. The actual data output from the system, such as the individual invoices and the printed orders, are recorded for future use. Although this is not kept on computer, the data can still be viewed as being stored. Such data is therefore called a store. Stores It consists of four components which are terminators, processes, flow arrows and stores. Data Flow Digram
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